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3 Sheets-Sheet 1.

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I Patented-Feb. 25, 1 890.

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. AHLST HAM ENGI (No Model.)

(No Model.) 3 Sheets-Sheet 2 A. O. AHLSTROM. Y

STEAM ENGINE Pait-ented Feb. 25, 1890.

WITNESSES Ah'oRN EY.

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(NoModell) I 2 u a Sheets-Sheet a.

A. C. AHLSTROM.

- STEAM ENGINE.

No. 422,328. Patented Feb. 25, 1890.

WITNESSES:

UNITED STATES PATENT OFFICE.

ALFRED o. AHLsrRoM, or PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TOcHRIs'roPH SCHNEIDER AND HENRY GIANELLA, or 'sAME PLACE.

STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 422,328, dated February25, 1890.

Application filed 'September 2'7, 1889- $crial No. 325,308. (No model.)

To all whom it may concern:

Be it known that I, ALFRED 0. AHLSTRGM, a subject of the King of Sweden,residing in the city and county of Philadelphia, State of 5Pennsylvania, have invented a new andv useful Improvement inSteam-Engines, which improvement is fully set forth in the followin gspecification and accompanying drawings. My invention relates tosteam-engines; and it primarily consists of a rotary driving-shafthaving a centrally-located ball with groove and an inclined crank, anoscillating diskpiston mounted on said crank, and means, substantiallyas described, for keeping said I piston in position.

The invention consists, secondarily, of de tails of construction andarrangement of the parts, as will be more fully hereinafter set forth.

Figure 1 representsa vertical section of an engine, showing myinvention. sents an elevation with one of the heads removed. Fig. 3represents a detail view of the shaft, ball, and crank. Fig. 4represents an elevation of the piston-disk. Fig. 7.5 represents asection on line a: 00 of Fig. 4.. Fig. 6 represents a detail view of thekey. Fig. 7 represents a detail view of the valve-plate.

Similar letters of reference indicate corresponding parts in the severalfigures.

Referring to the drawings, A designates the shell or casing, havingingress and exhaust ports B and O and a groove D, to receive a key E,for a purpose hereinafter stated. I-leads F are secured to the shell orcasing A, and are formed with inner concave recesses G, with outerconvex swells H, and outer collars J, to provide bearings for thedrive-shaft K, the said collars being con- 40 structed to receivesuitable packing or stuffing boxes. In lieu of the heads F, the shell orcasing may be made in sections, as desired. The shaft K is constructedwith a centrallylocated b'all L, having a circumferential groove Mtherein at an angle to the shaft K and surrounding a crank N at rightangles to the said groove M.

P designates the piston, formed of a disk having a beveled edge P, and aslot Q to be slipped over crank N, and allow the said disk to bearwithin the groove M, and is held in Fig. 2 repretact therewith by abifurcated key R, removably driven within the slot Q against the crankN. The key R is constructed in the manner set forth, for the purpose ofallowing movement thereof over a valve-plate S, Fig. 7, the outerenlarged end of the same being mounted in groove D in the shell Aagainst key E. The inner reduced end of said plate S is concaved andfits over the ball L, and the sides of said plate. are concaved to forman easy bearing on the legs of key R. The plate S is located between theports 13 and C, and is radially arranged relatively to the shaft K,thereby dividing half of the interior of the shell or casing A into twopassages to permit the steam to have full force on the pistondisk P atthe moment of greatest pressure. The interior of the shell or casing Aand the circumferential surface of the ball L are concentric, as is alsothe piston P. The diagonal groove M of the ball normally elevates thepiston P at one side and lowers it at the other, and is so arranged. asto initially open the ingress-port B and shut off the exhaust-port O.The steam entering port B impacts against the under side of thepiston-disk P and gradually elevates and oscillates the same, and themovement of said piston is transmitted through crank N to shaft K,thereby revolving the latter. As the steam continues to elevate thepiston P the exhaustport 0 is opened for the escape of the said steam.The ball L may be constructed of any preferred diameter, and the size ofsaid ball determines the speed and power of the engine. It will beunderstood that packing will be inserted between the joints of the partsand in the peripheral edge of piston P.

The engine is adapted for use in any of the 0 mechanical arts, as-wellas for domestic and other purposes found desirable and applica= ble.

The valveplate S maybe made in two parts and provided with interiorsprings to expand the same.

A series of the engines may be placed in tandem or otherwise and theexhaust steam from one be used in the other.

Having thus described my invention, what I claim as new, and desire tosecure by Let te'rs Patent, is

1. In a steam-engine, a shell or casing, heads therefor having interiorconical surfaces, a shaft having a ball with a groove and a crank, apiston engaging the groove of said ball, a key therefor with abifurcation to form legs, as set forth, and a valve-plate mounted in thebifurcation of said key and constructed with concave end and sides,substantially as described.

2. In a steam-engine, a sectional shell with the inner concave recessesG, a shaft with centrally-located ball having a circumferential groove,a slotted disk-piston bearing on an inclined crank in said ball, and abifurcated key in the slot and against the crank, said parts beingcombined substantially as described.

A sectional shell with inner concave recesses and a groove, a shaftwith. a ball having a circumferential groove and an inner inclinedcrank, a slotted disk-piston on said crank, a valve-plate in the saidgroove of the casing, and a key in said slotted disk, said parts beingcombined substantially as described.

4. In a steam-engine, a sectional shell having concave inner faces and agroove, a rotary shaft with ball having a circumferential groove and aninclined crank, a slotted diskpiston on said crank, a bifurcated key inthe slot and against the crank, and valve-plates with enlarged endsmounted in the groove of the shell and against a key E, said parts beingcombined substantially as described.

5. In a steam-engine, a sectional shell having concave inner faces and agroove, a 1'0- tary shaft with grooved ball having an inner inclinedcrank, a slotted disk on said crank, a key in the slot, and valve-platesmounted in the groove of the shell, said parts being combinedsubstantially as described.

6. A sectional shell having concave nner faces and a groove, a rotaryshaft with a grooved ball having an inclined crank, a slotted disk withbeveled edges in said groove,a key in the slot and against the crank,and valve-plates in the groove of the shell, said parts being combinedsubstantially as described.

7. In a steam-engine, the combination of a sectional shell or casinghaving the ports B and C, the shaft K, a grooved ball with diskpiston, akey for said piston, and a valve plate located between the ports B and Oand radially relative to the shaft, substantially and for the purposeset forth.

8. In a steam-engine, the combination of a sectional casing having theports 13 and G and the groove D, a rotary shaft with a grooved ball, adisk-piston and key, a valve-plate with enlarged outer end in thegroove 1) and between the ports and having a reduced inner end fittingon the ball of the rotary shaft, and a key in the said groove,substantially as described.

ALFRED C. AITLSTROM.

Witnesses:

WM. 0. WIEDERsHEIM, L. JENNINGS.

